Question: When did Ingvar Kamprad marry Kerstin Wadling?
Paraphrase: When did Ingvar Kamprad and Kerstin Wadling wed?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q216932 p:P26 ?s . ?s ps:P26 wd:Q47519864 . ?s pq:P580 ?value}